Aspect Ratio Calculator
Instantly calculate the missing width or height of an image, or find the simplified aspect ratio of any dimensions for perfect scaling.
Aspect Ratio Calculator
This calculator auto-updates when values change.
Calculated height
1,080
Formula
1,920 x 9/16
Preview ratio
16:9
About This Aspect Ratio Calculator
This aspect ratio calculator helps you scale images, videos, screens, and design layouts without distorting the original proportions.
Enter a known width or height with a target ratio, or enter both dimensions to simplify the ratio. The proportional relationship stays the same whether you use pixels, inches, millimetres, or another unit.
How to Use This Tool
- 1
Choose what to calculate
Select whether you want to find height, find width, or simplify a ratio from two dimensions.
- 2
Enter the known values
Add the known side and target ratio, or enter width and height when finding a ratio.
- 3
Use a preset if helpful
Pick common ratios such as 16:9, 4:3, 1:1, 9:16, or 21:9.
- 4
Review the scaled result
Use the result and preview to apply the same proportions in your design or media workflow.
Frequently Asked Questions
Does the unit matter?v
No. Aspect ratios are proportional, so the same formula works for pixels, inches, millimetres, or any other consistent unit.
How is the simplified ratio calculated?v
The calculator divides width and height by their greatest common divisor to produce the smallest whole-number ratio.
What happens if I enter zero?v
Zero or negative dimensions cannot produce a useful ratio, so the calculator asks for positive values.